According to the nebular theory, how did the Oort cloud form? a. It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system. b. It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets. c. It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. d. It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.

Apossible explanation for a set of facts that can be tested by further investigation is called

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

What is required for an electric charge to flow through a wire? zero resistance in the wire a balance of electric potential high resistance in the wire a difference in electric potential